ASCO 8650C74 Solenoid Valve Unit

Module Feature

8650C74 belongs to ASCO general service series 2/2-way internally piloted solenoid valve. Brass valve body, internal pilot structure, normally closed configuration. It requires minimum differential pressure to open. The valve adopts high-quality diaphragm sealing structure, stable switching performance, long service life. Widely used for automatic fluid cut-off control of compressed air, clean water and neutral gas in factory automation, HVAC and water treatment systems.

Working principle

When the solenoid coil energizes, the small pilot port opens, releases pressure on top of diaphragm. Medium pressure pushes diaphragm upward to open main flow passage. When coil de-energizes, pilot port closes, medium pressure accumulates above diaphragm to press diaphragm onto seat and shut off fluid flow.

Onboard components

Brass valve body, diaphragm assembly, solenoid coil, return spring, inlet/outlet ports, sealing gaskets.

LED indicators

No built-in LED indicators.

Hardware self-diagnosis

Check coil continuity, inspect external fluid leakage, test valve opening/closing action, inspect diaphragm aging and contamination.

Programming software

No dedicated programming software.

Electrical & Process Parameters

Model:8650C74 Brand:ASCO Device type:2/2 Way Internally Piloted Solenoid Valve Structure:Diaphragm pilot operated Valve state:Normally closed Body material:Brass Compatible media:Air, water, neutral gas Cooling:Natural convection cooling Protection:IP65 for coil assembly

Mechanical & Structure

Mounting:Inline pipe mounting Protection class:IP65 Housing:Brass valve body

Environmental

Operating temperature:-10℃ ~ +80℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non-condensing Certification:CE,UL compliant Status: ASCO original 2-way pilot solenoid valve for industrial fluid automatic control

Installation

Follow strict safety procedure before handling.Mount valve in horizontal pipeline direction, pay attention to flow direction mark on valve body.Connect power wiring to solenoid coil terminals, test valve on-off function and check leakage before full pressure commissioning.

Interface

Threaded pipe interface, solenoid coil electrical terminal block.

Diagnostic

Valve cannot open:insufficient differential pressure, coil burnout or pilot port blocked. External leakage:damaged gasket or loose threaded connection. Valve fails to close:diaphragm damaged or foreign matter stuck on sealing surface.

Product Brief

ASCO 8650C74 internally piloted 2/2-way normally closed solenoid valve, brass body, for air and water pipeline automatic on-off control.